Bob used to ______in the countryside . But now he is used to _________in the big city .

Why does the lake smell terrible?—Because large quantities of water

It is not until recently ______ the scientists have found proof of there being water on Mars

This is the first time we _____a film in the cinema together as a family. [ ]

I missed the first part of the film. It was really a pity．—-You _____home half an hour earlier.